Lathe for turning axles



(No Model.)

' R. R. SPEARS.

LATHE FOR TURNING AXLES.

N o. 475,163. Y Patented-May 17, 1 8-92.

NBS@ y UvVEJvTorR WITNESSES JQ/:LEMAf/g UNITED STATES PATENT OFFICE.

RALPH REED SPEARS, OF WHEELING, IVEST VIRGINIA, ASSIGNOR TO FRANK W. BEERS, OE BRIDGEPORT, CONNECTICUT.

LATHE FOR TURNING Axlglas.vl

SPECIFICATION forming part of Letters Patent No. 475,163, dated May 1'?, 1892.

i Application led January 22, 1892. Serial No. 418,951. (No model.)

To all whom it may concern,.- having on its underside rack-teeth,which are Be it known that I, RALPH REED SPEARS, a engaged by a pinion (see dotted lines, Fig.1)l citizen of the United States, residingat IVheelon a shaft 7, which is operated by hand to ing, in the county of Ohio and State of Testmove the carriage and the operating-tools to- 5 Virginia,haveinvented certain newand useful Ward or from the axle carried by the chuck. 5 5

Improvements in Lathes for Turning Axles; 8 denotes suitable tool-holders, and 9 a roand I do hereby declare the following to be a tating head or turret by which they are carfull, clear, and exact description of the invenried, the rotating head being provided with tion, such as will enable others skilled in the openings (see dotted lines, Fig. 2) to receive ro art to which it appertains to make and use the the shanks 10 of the tool-holders, said tool- 6o Sameholders being locked in position in the rotat- My invention has for its object to simplify ing head by set-screws 11. Near the forward and improve the construction of this class of end of the carriage is rigidly bolted a stoplathes, so as to enable the carriage to be lengthblock 12, the forward end of which is an are t5 ened, thereby increasing the bearing-surface. of a circle, and is undercut, as clearly shown, 65 This result I accomplish by providing a stopso as to be engaged by backwardly-extending block on the carriage itself, which acts,in contongues 13 upon the tool-holders. The exact nection with a spring-bolt in the carriage, to shape of the stop-block and the tongue is of lock the tool-holders when in operative posicourse not of the essence of my invention. It

zo tion against lateral movement and at the is sufficient to provide any suitably-shaped 7o same time to provide arigid bearing to receive tongue to engage under the overhanging porand take up the back-pressure upon the tooltion of the stop-block. At the forward end holders, thereby preventing theslightest looseof each tool-holder, in its under side, is a socket ness of the parts in use and insuring that 14, (see dotted linesinFig. 1,) which is adapte 5 round axles may be turned with absolute aeed to be engaged by a bolt 15,carried by aT- 75 curacy even after long continued use of the shaped block 16, the ends of which engage machine. under ribs 17 on the under side of\the bed on With these ends in view I have devised the opposite `sides of the central slot 18. The simple and novel construction of Which the block and bolt are forced upward toward the ;o following description, in connection with the locking position bya spring 19, secured to the 8o accompanying drawings, is a specification, under side of the carriage. Ribs 17 are made numbers being used to designate the several high enough at their rear ends to hold the parts. bolt in the retracted position-that is, the up- Figure 1 is a side elevation of my improved per or engaging end of the bolt is retained in ;5 lathe complete,a portion of the side of the bed the opening 2O in the carriage through which 85 being broken away; Fig. 2, a partial plan view it passes-but when the carriage is moved of the bed and carriage, showing the stop-block forward toward the operative position the and rotating head or turret with two toolends of the bolt ride down inclines 21 upon holders in position; and Fig. 3 is a section on the reduced forward ends of the ribs, so that .o the line a; Fig. 2, looking toward the left. spring 19 is permitted to move the bolt up- 9o 1 denotes the bed, at one end of which is a Ward through openings 20 and into engagebearing 2, in which is journaled a hollow manment with socket 14, whereby the tool-holder, drel 3, to which power is applied in any suitwhich has been placed in operative position, able manner, as by means of the belt-pulley, is rigidly locked against lateral movement.

.5 shaft, and gear shown in the drawings. At In practice the ends of sockets 14 are bev- 95 the inner end of the mandrel is a chuck 4 of eled at their outer edges, so as to permit the any suitable construction, which is adapted bolt to engage readily, and both opening 20 to carry the axle 5 to be operated upon. At and the socket are provided with bushings 23, the other end of the bed is a carriage 6, slidwhich may be readily removed and replaced o ing on Ways 22 on the bed, said carriage should they become Worn in use. This lock-` loo ing of the tool-holders in operative position, so that there can be no looseness of the parts, which quickly produces lost motion in use, is a very important feature of construction, for the reason that in other machines of this class there has been no` means of preventing increasing looseness of the parts, so that after the machines had been run for awhile it was wholly impossible to turn round aXles,the result being that very imperfect work was produced or else a number of parts had to be frequently replaced by new ones. It will be seen that as the tool-holders move forward while the tools are operating upon the axle, in addition to the lateral strain upon the toolholders, which is wholly prevented by the engagement of the bolt with the socket, there is a backward pressure upon the tool-holders, which in the presentinstance is entirely taken up by the stop-block 12.

Having thus described my invention, I claim- 1. In a machine of the class described, the combination, with the carriage and the toolholders, each of which is provided with a backwardly-extending tongue and in its under side with a socket, of a stop-block upon the carriage, the forward end of which is undercut to correspond with the tongue, and a springactuated bolt upon the carriage adapted to engage the sockets in the tool-holders, so that the tool-holder in use is held against lateral movement and the back-pressure is taken up, thereby preventing looseness of the parts.

2. The combination, with the bed having a central slot and on opposite sides thereof ribs made highest at their rear ends and reduced at their forward ends, the carriage and toolholders, each of which is provided with a backwardly-extending tongue, and a socket in its under side, of a stop-block upon the carriage, the forward end of which is an arc of a circle and is undercut to receive the tongue, a bolt carried by a T-shaped block, the ends of which engage the ribs, and a spring secured to the block and the carriage, by which the bolt is moved upward toward the locking position, so that when the carriage is retracted the ends of the block will engage the rear ends of the ribs, holding the bolt out of locking position, and when the carriage is moved forward the reduced forward ends of the ribs f will permit the spring to raise the bolt into engagement with the socket.

3. The bed having a central slot and ribs on opposite sides thereof, the forward ends of said ribs being reduced, as shown, in combination with the carriagehaving a stop-block undercut in its forward side, a spring-actuated bolt carried by a block, the ends of which engage the ribs, and the tool-holders, each of which is provided with abackwardly-extending tongue adapted to engage the stop-block, and a socket adapted toreceive the bolt when the carriage is moved forward and the ends of the block ride down upon the reduced portion of the ribs.

In testimony whereof I affix my signature in presence of two witnesses.

RALPH REED SPEARS.

Witnesses:

FRANK SCHROEDER, JOHN W. SCHULTZE. 

